A new method for digital simulation and harmonic analysis of AC/DC power systems is presented, and its corresponding computer program, DSHAP, has been developed. For all subsystems of an AC/DC power system, detailed mathematical models and the exact interfaces between them are proposed. For harmonic analysis, the fast anti-aliasing Fourier transform method (FAFT) is adopted. The program has not only high calculation precision but also satisfactory versatility, which is flexible, convenient and has fulfilled initial practical requirements. By using the DSHAP, the digital simulation and harmonic analysis of the Three Gorges AC/DC power system are carried out and some results are given.
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